Tire-gage.



AI AA. SONNICHSEN.

TIRE GAGE.

APPLICATION FILED DEc.10.19x1.

Patented Aug. 6, 1918.

f STATES ,PATENT onirica.'

i at soNNIcHsEN, or MILWAUKEE, WISCONSIN, nssi'enoza sro rao'rnx manukracrumne company, or'cmcneo, ILLINOIS, A coaroan'rxon or ILLINOIS.

I To all whom t may concern:

TIRE-GAGE.

- Beit known that I, ANDREAS M. SoNivioH- een, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and usefulilmprovements in Tire-Gages, of

" which the following is a full,'clear,'c`oncise,

'and enactV description, reference being had to `the accompanyingdrawing forming' a part of4 this speciication.

. My :invention relates lto improvements in 'ftire gages tion oa device by means of which the presand has or'its object the producsure withinzan automobile tire may be ascertained without any liability of delating .y the tire durin the operation.

LA further o jecty is the production of a A device' by `means .of which the indicated pres- ,sure may oe read afterV thev gage is detached from thetire. y

A 'further object isjthe reduction `of -a deviceoff simp'le thou h e cient construe#l tion, and one not liebe todisarrangement of parts.'

A furtheriobjectis the production of a device in which the tension'of the spring may :A urther object'sthe production of conthrough the medium of which venient. means e the vpressure may be accurately read-and the rear of my device; Fig. 3 'is an enlarged sectional view of my parts in the several registering mechanism returned to its initial position.l` y

l. v These and suchl other ob'ects as Amay here.

inafterappear arefettaine by my device, an embodiment of-'whichis illustratedv in the acflapmpanying darwings, in whichmy evicelooliing tower the front;

fFig. 2 is a perspective view showing the device taken on the ine v"3 of Fig. '2 look- `iugrin thev direction indicated by the arrows; a

` Y' g. il is a perspective view of my ad]u'st 5 ing mechanism, an l n y. l u l Fig. 5 is a perspective' View of adetnil of '-rig.1.. Y

--Lik numerals of referencevindicate like ures of thedrawing.

AReferring now 'to t e drawing2 `ii reprehaving an 'indicating i speenicatinn of Letters Patent.

Application mail December 10, 1917. Serial No. 208,519.

4igure A1 represents a erspeetive view of extending lengthwise thereof throu hout the -upper half of its peripher an Patented is threaded at its upper end`8 and at its lower end 9, and provided at its top with'a screw cap 10 and at its bottom with a screw" base 11. Fitting within the screw b a'se llisa metal cup -12 having a central stein pro Auge .6

vided with an opening 14 extending there- 'i through. The end 15 of the stem projecting above they surface of a rubber washer :16A mounted within the cup, serves to unseat the ordinary tire valve when the gage is pressed thereon. A piston rod 17 is mounted within the cylinder having a pair of metal washers 18-148 riveted on the bottom, and also having a rubber or felt washer 19 positioned between the metal washers' 18-18 serving to make an'air tight iston head between the chamber 20 above t e metal cup 12 andthe bottom. of the piston.

I A sprin 21 surrounds the piston rod ,17 and exten s from the bottom of the piston-A practically to the top oi the casing. A guiding sleeve 22 extends dovs'nwardlly7 from the top kof the-casing of suliicient meter to permit thegentrance of the spring 21. This sleeve'is enlarged as shown at 23, makin a Itight fit with fthebore of the casing an -is provided with a 1peripheralshoulder 24 `fitting on the top o the casing. An adjusting screw 25' is screwed within the. top of this sleeve, the bottom 26 of which enga es the top of the spring 21. lt will thus e seen that by the adjustment of the screw 25 the tension of the spring 21 may be made within reasonable'limits, or in fact within any limit by varying the length of the screw or extending its end downwardly within the guiding sleeve.

The outer casing is provided with a slot 27 v a split spring sleeve 28 is rovided Aavinga spring member 29 adapte to press against the inner periphery of the casing andA frictionally holdl the sleeve in any desired position. A

portion of the upper edge of the spring be read. An opening 33 is provided on the opposite periphery to that of the window into which the ear 30 enters.

' t will be noted that the movement of the sleeve up and down carries with it the spring member 28, The bottom of this spring member when the sleeve is at its lowest position rests on the top of the washer 18. In the use of my device, when the Gage is pressed on the top oi' the tire valve the end 15 of the stem unseats the valve permitting air to pass through the opening it and into the chamber 20 beneath the piston, forcing the piston upwardly against the pressure of the spring 21 resting against the bottom of the adjusting screw 25. As the pressure increases the upward movement. of the piston carries with it the spring member 28 and also the registering sleeve 3l. When the maximum pressure within the tire is reached the registering sleeve has traveled upwardly along with the member 28 and the maximum pressure is shown through the window 32. lli/hen the gage is taken. ofi the tire valve, the friction member together with the registering sleeve is held in its highest position and remains there until it is forced down by hand, making it unnecessary to see what the pressure is at the instant the gage is withdrawn as any length of time can elapse between making the test and reading the pressure.

By the use of the adjusting screw 25 l make it possible to take care of any irregularities between actual pressure and indi- `cated pressure in the event that the spring becomes worn, it simply being necessary to remove the cap l0 and turn down the screw 25 until the desired tension is secured. By the use of the cap i0 all danger of varying the tension of the spring by careless handling is avoided, and by hurling the outer periphery of the caps 10 and 11 as shown at 34, it becomes possi-ble to readily screw and unscrew the caps in assembling, disassembling and adjusting the parts.

I am aware that other modifications may suggest themselves that are not here setl forth, but which will come within the spirit of my invention.

Having thus described my invention, what nav-ieee l claim as new and desire to secure by Letters Patent is:

1. A tire gage comprising an outer slotted casing, having indicating numerals thereon, a piston head, a piston rod mounted within said casing, an open' screw threaded cap adapted to fit over the bottom of sld casing, a valve unseating means mounted in said cap below said piston head and having an opening communicating with the interior of said casing below the piston head, an adjusting screw fitting within the top of said casing and movable lengthwise thereof, a spring surrounding said piston rod and eX- tending from the piston head to the base of the adjusting screw, a friction sleeve loosely mounted within said casing on the to of said piston head, said sleeve being provided with a projecting ear adapted to extend through the slot in said casing, a registering sleeve mounted on the outside of said casing and engaging said ear whereby the maximum upward movement of said frictional sleeve may be indicated onthe scale on said sleeve.

2. Attire gage comprising an outer slotted casing, having indicating numerals thereon, a piston head, a piston rod mounted within said casing, an open screw threaded cap adapted to fit over the bottom of said casing, a valve unseating means mounted in said cap below said piston head and having an opening communicating with the interior of said casing below the piston head, an adjusting screw fitting within the top of said casing and lmovable lengthwise thereof, a spring surrounding said piston rod and eX- .tending from the piston head to the base of the adjusting screw, a friction sleeve loosely mounted within said casing on thetop of said piston head, said sleeve being provided with a projecting ear adapted to extend throughv the slotin said casing, a registering sleeve provided with an opening opposite the scale on said outer casing whereby the maximum upward movement of said frictional sleeve may be read through said opening in the registering sleeve.

In witness whereof, l have hereunto subscribed my nameu ANDREAS M, SONNCHSEN. 

